What do you mean by 'design'? Aesthetics? You can't. It's too subjective and too nuanced to be 'validated'. If you want to find out if people like your stuff, t

What do you mean by 'design'? Aesthetics? You can't. It's too subjective and too nuanced to be 'validated'. If you want to find out if people like your stuff, try and join dribbble. If you mean design in the true sense of the word, are your solutions merely adequately solving the problem or are they elegant? Have a look at the 10 principles for good design from Dieter Rams (https://www.vitsoe.com/gb/about/good-design https://www.vitsoe.com/gb/about/good-design) and see if they apply to your solutions.